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NCERT Class XI Chemistry Solutions

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Question : 28 of 40
Marks: +1, -0
What is the total number of sigma and pi bonds in the following molecules?
(a) C2H2\mathrm{C}_2\mathrm{H}_2
(b) C2H4\mathrm{C}_2\mathrm{H}_4
Solution:  
(a) C2H2\mathrm{C}_2\mathrm{H}_2 → H−σC≡ππC−σH\mathrm{H}\overset{\sigma}{-}\mathrm{C}\overset{\underset{\pi}{\pi}}{\equiv}\mathrm{C}\overset{\sigma}{-}\mathrm{H} ;
No. of σ bonds = 3, No. of π bonds = 2
(b) C2H4\mathrm{C}_2\mathrm{H}_4 → C∣σH∣σH==πσCH∣σ∣σH\overset{\mathrm{H}}{\overset{|\sigma}{\mathrm{C}}}\underset{H}{|\sigma}=\overset{\underset{\sigma}{\pi}}{=}\overset{|\sigma}{\mathrm{C}^{H}}\underset{H}{|\sigma} ; No. of σ bonds = 5,
No. of π bonds = 1
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